Stages Of Sleep That People Go Through Each Night Essay

836 Words Apr 25th, 2016 4 Pages
There are five stages of sleep that people go through each night. Stagees one, two, three, four, and REM (rapid eye movement) sleep. These stages progress cyclically from one to REM, and then begin again with stage one. A complete sleep cycle takes an average of 90-110 minutes. Throughout the night REM sleep stages increase. Stage one is light sleep where you drift in and out of sleep and can be awakened easily. In this stage, the eyes move slowly and muscle activity slows. During this stage, many people experience sudden muscle contractions preceded by a sensation of falling. eye movement stops and brain waves become slower with only an occasional burst of rapid brain waves. When a person enters stage three, extremely slow brain waves called delta waves are interspersed with smaller, faster waves. In stage four, the brain produces delta waves almost exclusively. Stages three and four are referred to as deep sleep or delta sleep, and it is very difficult to wake someone from them. In deep sleep, there is no eye movement or muscle activity. This is when some children experience bedwetting, sleepwalking or night terrors. Slow wave sleep comes mostly in the first half of the night, REM in the second half. Waking may occur after REM. If the waking period is long enough, the person may remember it the next morning. Short awakenings may disappear with amnesia. In the REM period, breathing becomes more rapid, irregular and shallow, eyes jerk rapidly and limb muscles are…

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